CBSE Questions for Class 11 Medical Chemistry Chemical Bonding And Molecular Structure Quiz 5 - MCQExams.com



Consider the structure pictured above, including the accompanying ligand.
Which of the following CORRECTLY identifies the pictured compound by name, and identifies the bonding involved in its structure?
532145.jpg
  • The compound is ammonium dichromate. It contains both ionic and covalent bonds.
  • The compound in diammonium chromate. It contains both ionic and covalent bonds.
  • The compound is ammonium dichromate. It contains only ionic bonds.
  • The compound is ammonium chromate. It contains ionic bond.
In C-C bond is $$C_2H_6$$ undergoes heterolytic fission, the hybridisation of two resulting carbon atoms is/are :
  • $$sp^2$$ both
  • $$sp^3$$ both
  • $$sp^2,sp^3 $$
  • $$sp,sp^2$$
The shapes of $$IF_3$$ and $$IF_7$$ are respectively:
  • square pyramidal and pentagonal bipyramidal
  • octahedral and pyramidal
  • trigonal bipyramidal and square antiprismatic
  • distorted square planar and distorted octahedral
The total number(s) of stable conformers with non-zero dipole moment for the following compound is (are):
878452_49209740ea634f74a3415a9148833028.png
  • 1
  • 2
  • 3
  • none of these
There is change in the type of hybridisation when:
  • $$NH_3$$ combines with $$H^+$$
  • $$AlH_3$$ combines with $$H{^-}$$
  • $$NH_3$$ forms $$NH_2{^-}$$
  • $$SiF_4$$ forms $$SiF_4^{2-}$$
The hybridisation and geometry of $$BrF_3$$ molecules are:
  • $$sp^3d$$ and $$T$$ shaped
  • $$sp^2d^2$$ and tetragonal
  • $$sp^3d$$ and bent
  • none of these
What is the angle between any two bonds in methane molecule?
  • $$105^o54'$$
  • $$109^o28'$$
  • $$119^o28'$$
  • $$190^o28'$$
Which of the following structure of a molecule is expected to have three bond pairs and one loan pair of electrons $$?$$
  • Octahedral
  • Trigonal planar
  • Pyramidal
  • Tetrahedral
The number of lone pair(s) of electrons on the central atom in $$[BrF_4]^-$$, $$XeF_6$$ and $$[SbCl_6]^{3-}$$ are respectively:
  • $$2, 1$$ and $$1$$
  • $$2, 1$$ and $$0$$
  • $$2, 0$$ and $$1$$
  • $$1, 0$$ and $$0$$
The number of $$C-C$$ sigma bonds in the compound is:

631543_947eca942b6f4b92ae53aa11b4dd58aa.png
  • $$16$$
  • $$17$$
  • $$18$$
  • $$11$$
Which has a maximum repulsive interaction?
  • $$bp - bp$$
  • $$lp - lp$$
  • $$lp - bp$$
  • Equal
Which of the following statements are true with respect to electronic displacement in a covalent bond?
I. Inductive effect operates through $$\pi$$-bond.
II. Resonance effect operates through $$\sigma$$-bond.
III. Inductive effect operates through $$\sigma$$-bond.
IV. Resonance effect operates through $$\pi$$-bond.
V. Resonance and inductive effects operate through $$\sigma$$-bond.
  • III and IV
  • I and II
  • II and IV
  • I and V
Considering x-axis as the internuclear axis, which out of the following will not form a sigma bond.
  • $$1s$$ and $$1s$$
  • $$1s$$ and $$2{p}_{x}$$
  • $$2{p}_{y}$$ and $$2{p}_{y}$$
  • $$1s$$ and $$2s$$
Bond polarity of diatomic molecule is because of:
  • difference in electron affinities of two atoms
  • difference in electronegativities of two atoms
  • difference in ionisation potentials
  • all of the above
The table shown below gives the bond dissociation energies $$(E_{diss})$$ for single covalent bonds of carbon ($$C$$) atoms with the element $$P, Q, R$$ and $$S$$. Which element has the smallest atoms?
Bond$$E_{diss}(kJmol^{-1})$$
$$C - P$$$$240$$
$$C - Q$$$$328$$
$$C - R$$$$276$$
$$C - S$$$$485$$
  • $$P$$
  • $$S$$
  • $$R$$
  • $$Q$$
In $$TeCl_4$$, the central atom tellurium involves:
  • $$sp^3$$ hybridisation
  • $$sp^3d$$ hybridisation
  • $$dsp^2$$ hybridisation
  • $$sp^3d^2$$ hybridisation
What fraction of charge is present on $$I$$ in covalently bonded $$\overset { \delta + }{ H } -\overset { \delta - }{ I } $$ if the dipole moment of $$HI$$ is $$0.38\ D$$ and the bond length is $$\ 1.61\ \mathring { A } $$?
  • $$5$$%
  • $$16$$%
  • $$33$$%
  • $$79$$%
Which molecule has minimum dipole moment?
  • $$H_{2}O$$
  • $$AgI$$
  • $$PbSO_{4}$$
  • $$HBr$$
Which carbonyl compound has maximum dipole moment?
If the element $$A$$ has three electrons in an outer shell and $$B$$ has six electrons in an outer shell, then the formula of the compound formed by these element will be:
  • $$A_3B_2$$
  • $$A_2B_3$$
  • $$AB_3$$
  • $$A_6B_3$$
In which one of the following the central atom is $$sp^{3}$$ hydridised?
  • $$NH_{4}^{+}$$
  • $$BF_{3}$$
  • $$SF_{6}$$
  • $$PCl_{5}$$
  • $$XeF_{4}$$
In $${ PO }_{ 4 }^{ 3- }$$, the formal charge on each oxygen atom and the $$P-O$$ bond order respectively are:
  • $$-0.75,0.6$$
  • $$-0.75,1.0$$
  • $$-0.75,1.25$$
  • $$-3,1.25$$
Which of the following has maximum number of lone pairs associated with $$Xe ?$$
  • $$XeO_3$$
  • $$XeF_4$$
  • $$XeF_6$$
  • $$XeF_2$$
The dipole moment of the chlorobenzene is $$1.5D$$. The dipole moment of given compound is:
694232_68cf3399e12c43bc8704a2dc71e357d4.png
  • $$0D$$
  • $$1.5D$$
  • $$3.0D$$
  • $$2.25D$$
The total number of stable conformers with non-zero dipole moment for following compound is (are) [Eclipsed forms are considered to be highly unstable]
775940_17407da1387d4744bc75b7068b4ff4ab.png
  • $$1$$
  • $$2$$
  • $$3$$
  • $$4$$
Which of the following compounds have zero dipole moment?
  • $${ CH }_{ 3 }Cl$$
  • $${ CH }_{ 2 }{ Cl }_{ 2 }$$
  • $${ BF }_{ 3 }$$
Match the given chemical reactions with the products listed in the box and select the correct option from the given codes.
(i) $$CaO$$ (ii) $$Mg(OH)_{2}$$ (iii) $$NO_{2}$$ (iv) $$Cu$$ (v) $$MgCl_{2}$$ (vi) $$O_{2}$$ (vii) $$Fe_{2}O_{3}$$ (viii) $$CaCO_{3}$$.
P. Mixing magnesium oxide with water
Q. Brown deposit on iron nail kept in copper sulphate solution
R. Carbon dioxide is passed through lime water
S. Absorption of ultraviolet radiations by ozone.
  • $$P - (iv), Q - (vii), R - (i), S - (vi)$$
  • $$P - (iv), Q - (ii), R - (i), S - (iii)$$
  • $$P - (ii), Q - (iii), R - (viii), S - (vii)$$
  • $$P - (ii), Q - (iv), R - (viii), S - (vi)$$
Dipole-dipole interactions $$d\pi-p\pi$$ bond present in: 
  • $$CO_3^{2-}$$
  • $$PO_4^{3-}$$
  • $$N{ O }_3^-$$
  • $$N{ O }_2^-$$
Which of the following ions is mostly unlikely to exist?
  • $${ Li }^{ - }$$
  • $${ Be }^{ 2+ }$$
  • $${ B }^{ - }$$
  • $${ F }^{ - }$$
Which of the following would have permanent dipole moment? 
  • $$SiF_4$$
  • $$SF_4$$
  • $$XeF_4$$
  • $$BF_3$$
Observe the given figure carefully and filled in the blanks by choosing an appropriate option.
811576_4e45400d4d6b49f7884000d69bf10142.jpg
  • Crystallisation, Iron, Chemical reversible, Iron oxide
  • Sublimation, Zinc, Physical irreversible, Zinc oxide
  • Melting, Copper, Physical reversible, Copper oxide
  • Crystallisation, Iron, Chemical irreversible, Copper
In which pair of molecules is the permanent dipole in molecule I greater than that in molecule II?
  • $$CH_{3}CH_{2}Cl, \ \ CH_{3}CHCl_{2}$$
Which one of the following species is diamagnetic in nature?
  • $$He^+_2$$
  • $$H_2$$
  • $$H^+_2$$
  • $${ H }^-_2$$
How many ways a bond between two atoms can cleave?
  • $$One$$
  • $$Five$$
  • $$Three$$
  • $$Four$$
Which of the following has highest dipole moment?
  • $${CH}_{3}Cl$$
  • $${CH}_{3}F$$
  • $${CH}_{3}Br$$
  • $${CH}_{3}I$$
Which of the following compound has non zero dipole moment?
  • $$PCl_{3}$$
  • $$PCl_{2}F_{3}$$
  • $$PCl_{3}F_{2}$$
  • $$PClF_{4}$$
Which one of the following species has plane triangular shape :
  • $${ N }_{ 3 }^{ - }$$
  • $${ NO}^{-}_{ 3 }$$
  • $${ NO }_{ 2 }^{ - }$$
  • $${ CO }_{ 2 }$$
Among these compounds the correct order of $$C-N$$ bond length is :
879886_94047c27fa1c4de09f3f1783386a0313.png
  • $$IV > I > II > III$$
  • $$III > I > II > IV$$
  • $$III > II > I > IV$$
  • $$III > I > IV > II$$
Which of the following compounds shows strongest hydrogen bonding?
  • $$HF$$
  • $$H_2O$$
  • $$NH_3$$
  • $$CH_3OH$$
According to molecular orbital theory, which of the following will not exist?
  • $$H_2^+$$
  • $$Be_2$$
  • $$B_2$$
  • $$C_2$$
The synthetic steroid ethynylestardiol (1) is a compound used in the birth control pill. How many $$sp^3$$ hybridised carbon atoms are present in compound (1) ?
988743_077c0214a56e4a56a832b7c52ae8497a.png
  • 8
  • 9
  • 10
  • 11
  • 12
The synthetic steroid ethynylestardiol (1) is a compuond used in the birth control pill. How many $$sp^2$$ hybridised carbon atoms are present in compound (1)?
988744_1f2960449d31448e9535852aa8268062.png
  • 4
  • 5
  • 6
  • 7
  • 8
$$1,3,5,7-$$ Octatetraene contains $$ \underline { X }$$ $$\sigma -$$ bonds and $$\underline { Y }$$ $$\pi-$$ bonds. $$X$$ and $$Y$$ are:
  • $$23,\ 4$$
  • $$17,\ 4$$
  • $$18,\ 5$$
  • $$33,\ 2$$
Arrange the following molecules in the increasing order of $$\alpha$$ to $$\pi$$ bond ratio?

937332_c8c9226e30ef4fd0b518517b4f298d54.png
  • (2)<(3)<(4)<(1)
  • (2)<(4)<(3)<(1)
  • (3)<(2)<(1)<(4)
  • (2)<(3)<(1)<(4)
Which of the following is an isoelectronic pair?
  • $$ICl_{2}$$,$$ClO_{2}$$
  • $$BrO_{2}{^-}$$, $$BrF_{2}^{^+}$$
  • $$ClO_{2}$$, $$BrF$$
  • $$CN^{-}$$,$$O_{3}$$
The synthetic steroid ethynylestardiol (1) is a compuond used in the birth control pill.
How many $$sp$$ hybridised carbon atoms are present in compound (1) ?
988745_f9ce424e3c7e45c98d3b5510df37cf8d.png
  • 2
  • 4
  • 6
  • 8
  • 10
In which of the following molecule/ion all the bonds are not equal?
  • $$XeF_4$$
  • $$BF_4{^-}$$
  • $$C_2H_4$$
  • $$SiF_4$$
A diatomic molecule has a dipole moment of 1.2 D. If the bond legth is $$1.0\times 10^{-8}$$ cm, what fraction of charge does exist each atom?
  • 0.1
  • 0.2
  • 0.25
  • 0.3
Which of the following statements is true about hydrogen bonding?
  • $$Cl$$ and $$N$$ have comparable electronegativities yet there is no $$H-$$bonding in $$HCI$$ because size of $$Cl$$ is large
  • Intermolecular $$H-$$bonding results in decrease in m.p. and b.p
  • Ice has maximum density at $$0^o$$C due to $$H-$$bonding
  • $$KHCl_2(HCl_2{^-})$$ exists but $$KHF_2(HF_2{^-})$$ does not exist due to lack of $$H-$$bonding in $$HCl$$
Dipole moments of given compound will be:
989268_ca9d24adb21c4f4a834f3301c212a1b8.PNG
  • $$(A) = 6.87 D, (B) = 4.11 D$$
  • $$(A) = 4.11 D, (B) = 6.87 D$$
  • $$(A) = 4.11 D, (B) = 4.11 D$$
  • $$(A) = 6.87 D, (B) = 6.87 D$$
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